Propeller.



S. M. KEKUEWA.

, PROPELLEB. APPLICATION FILED 050.23, 1916. RENEWED JUNE 6.191s.

1,290,573, 3 Patented Jan. 7,1919.

v INVENTOR J UNITED STATES PATENT ormca. 1

smunr. moans xnxunwn, or rename, TERRITORY-O1 HAWAII.

PBOPELLEB.

Specification of Letters Patent. 4 T Patented J an. 7, 1919.

1 Application mes master as, 1915, Serial 110. 138,560. Renewed June 6, 1918.- Serial No. 238,581.

To all whom it may concern: I

Be it known that I, SAMUEL KiiKUEWA,

residing at Lahaina, Maui, Territory of Hawau, have invented certain new and useful Improvements in Propellers, of which the following is a specification;

This invention relates tocertam new and useful improvements in propellers for water navigation or aerial navigation, and the Inventlon particularly has for its ob ect to provide an improved construction of pro peller in' which provision is made for ob taining a better grip onthefluid medium through which the vehicle is being propelled, than is done in the ordinary types of propellers now, in common use, and the invention has for its object to 'prov1de a construction which can be adapted and used not a of blades being somewhat diverged from one another from the hub outwardly whereby the propeller blades will effect a double grip on the fluid medium, as it were, and

only for the propulsion of vessels through water but may be used on air ships and aeroplanes.

7 In its generic nature, the invention comrisesa duplex propeller composed of a ont and a back set of blades, the rearward set of blades being ofiset' with relation tothe forward set of blades and being of a shorter spread than the forward blades, the two sets thus prevent racing of the propeller.

In its more detail nature, the invention includes those novel features of construction, combination and arranfglement of arts, all of which will be first 11y descri d, then be specifically .pointed out in the appended claims, and illustrated in the accompanying drawings, in which Flgure 1'1s'a rear elevation of one form of the improved propeller. Fig. 2 is a side elevation.

- Fig. 3 is a vertical longitudinal section; on

the'hne 3-,3 of Fi 1.

Fig. 4is a rear e evation of a modification ..of the invention. 1

j Fig. 5 is a side elevation ofthe form shown in Fig. 4.

Referrin now to the accompan ing draw ings, in w ich like numerals 0' reference indicate like parts in all of the figures, 1 designates the shaft on which the propeller hub 2 is suitably mounted Projecting from the hub 2 is a pair ofmaster blades cal plane'and 4 represents a subsidiary pair which are inclined slightly from the vrti of blades located in rear of the blades 3 and inclined from the vertical plane in a direction opposite to the inclination or curvature of the blades 3, it being understood that both blades 3 and 4- are pitched in the same 1 propulsive general direction so as to effect a force in the samegeneral d rection.

It will be noticed that the blades 4'are of l shorter length than-the blades 3, as it is found that such a construction of propeller exerts a more uniform and non-slipping grip on the fluid medium than would other-.

wise be the case. It will be also noticed that the two sets of blades areofi'set with relation to one another, (see Fig. .1') to some extent,

the blades, however, overlapping throu hout a large part of their area, as is clearly s own in Fig.1 of the drawings.

' Instead of using one propeller of two sets of blades, such as shown in Figs. 1-3, in-

elusive, the units maybe duplex,- as shown in Figs. 4 and 5, for instance, in which event, one unit will be set at right angles to the other unit'so as to give the appearance of a' four-bladed propeller when viewed in end view,-as indicated in Fig. 4.

It should be understood that the propeller may be made in any size desired, dependent upon the work it has to do. Foraeroplane use, the blades are, of course, made considerably longer than 'for use in a fluid medium,

; such as water.

From the foregoing description taken in connection with the accompanying drawing,

it is thought the completeconstruction, operat10n and advantages of the invention will be readily understood by those skilled in the art.

What I claim is 1 1. A propeller comprising a hub, two sets of blades mounted on said hub',-0'ne set being located directly in advance of the other set, and ofiset with relation thereto, one set of blades beingpurved in one direction and the other set of lades being curved in the 'opposite direction both sets of blades having their pitch orinclination in the same general di-' tion andthe ethereal? of blades curved in the opposite direction, both sets of blades having their pitch or inclination in the same eneral direction to each efiect a propulsive orce in the same eneral direction.

5 3. In a propelling mechanism, a shaft, two propellers on said shaft, each propeller including a hub and two sets of blades, one set of blades being a major set and the other set of blades being a minor set, the minor 10 set being directly located to the rear of and offset with relation to the major set, one propeller beingmounted on the shaft in a position 90 from the position of the other set, one pair of blades of a propeller being curved in one direction with relation to the vertical and the other pair being'curved oppositely thereto, both sets being pitched in the same direction.

SAMUEL MOANA KEKUEWA. 

